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The o-xylene, m-xylene, and p-Xylene are constitutional isomers. The correct option is D.
<h3>What are isomers?</h3>
Isomers are the elements or polyatomic elements that have similar molecular formula.
All options are attached here:
A.optical isomers
B.structural isomers
C.geometric isomers
D.constitutional isomers
Thus, the correct option is D.constitutional isomers.
Learn more about isomers
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